GLASS SUBSTRATE FOR MAGNETIC DISK, METHOD FOR MANUFACTURING THE SAME, AND MAGNETIC DISK

摘要

PROBLEM TO BE SOLVED: To solve a problem that a sagging amount is liable to increase at an end in proportion to a polishing time when colloidal silica slurry is used for final polishing by reducing the roll-off of a glass substrate before final polishing.

SOLUTION: This method manufactures the glass substrate for a magnetic disk by polishing a circular glass plate. The method includes a process for polishing a main surface of the circular glass plate by using a water soluble organic high polymer having an amino group, at least one water soluble organic high polymer selected from a group composed of a water soluble organic high polymer having an amine base and a water soluble organic high polymer having a quaternary ammonium base, the slurry containing cerium oxide abrasive grain having an average grain diameter of 0.4-1.8 μm, and polishing cloth.

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